Welcom to Pet Forums, I'm so sorry to hear you are thinking of rehoming your bird, is there any advice we can give that may help you keep him?
If you really want to go down the rehoming route and feel you have no alternatives I would recommend you use a rescue where they can always guarantee him a good home.
Sadly there are many un-reputable rescues, like the parrot zoo/sanctury where they take human imprinted birds and put them into large aviaries to fend for themselves
The only ones I would recommend are
The Society for Conservation in Aviculture or Jebirds run by June in North Wales.
They will ensure the bird isn't sold on and bred from and will always have a caring, loving and experienced home.
Good luck in whatever you decide.